Data update

Task/String-matching/Java/string-matching-1.java

@@ -1,2 +1,22 @@
+// For this task consider the following strings
 String string = "string matching";
 String suffix = "ing";
+// The most idiomatic way of determining if a string starts with another is the String.startsWith method.
+string.startsWith(suffix)
+// Another way is to use a combination of String.substring and String.equals
+string.substring(0, suffix.length()).equals(suffix)
+// To determine if a string contains at least one occurrence of another string, use the String.contains method.
+string.contains(suffix)
+// A slightly more idiomatic approach is String.indexOf, which also returns the index of the first character.
+string.indexOf(suffix) != -1
+// The most idiomatic way of determining whether a string ends with another is the String.endsWith method.
+string.endsWith(suffix);
+//Similarly, a combination of String.substring and String.equals can be used.
+string.substring(string.length() - suffix.length()).equals(suffix)
+// If you're looking to find the index of each occurrence, you can use the following.
+int indexOf;
+int offset = 0;
+while ((indexOf = string.indexOf(suffix, offset)) != -1) {
+    System.out.printf("'%s' @ %d to %d%n", suffix, indexOf, indexOf + suffix.length() - 1);
+    offset = indexOf + 1;
+}